

.wrapper {
    position: relative;
    height: 100%;
    width: 100%;
    overflow: hidden;
    background-color: #f0f8ff;
}
.back {
    z-index: 1;
    width: 100%;
    height: 100%;
    background-image: url('../../assets/img/bg.jpg');
    background-position: 50% 50%;
    background-size: cover;
    background-repeat: no-repeat;
}
.main {
    z-index: 2;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    margin-top: -20px;
    text-align: center;
    vertical-align: middle;
    color: #fff;
}
.title {
    margin: 8px 0;
    font-size: 30px;
    color: #fff;
}
.tips {
    font-size: 18px;
    font-weight: 700;
}
.button {
    width: 100%;
    height: 30px;
    margin-top: 20px;
    background-color: #2791d9;
    line-height: 30px;
    color: #fff;
    cursor: pointer;
}